Ockham Mill Stream at Ockham Mill
EA name: OCKHAM MILL STREAM AT OCKHAM MILL
Environment Agency sampling point TH-PWER0014 · Freshwater - rivers · listed as open (“open” does not mean it is sampled now)
These are samples taken on a date, not live readings of the river. Results reach the Environment Agency's archive days to months after the sample is taken, so the newest here may be weeks or months old. FloodRadar does not grade them.
Where and when
- Last sampled
- 13 Aug 2026, 13:0749 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)
- Samples banked
- 21 since 31 Jul 2024 Imported periods: 1 Oct 2023 – 30 Sep 2026. Samples outside them are not shown here.
- Latest sample
- River / running surface water Environmental monitoring statutory (EU directives)
- Where
- National Grid 505570, 157900As published, to the nearest 10 m. Open in a map
- River, by its own name
- Ockham Mill Stream
- River, by the map
- Ockham Mill StreamPlaced on the river its name gives, 1 m from the line.
- Next gauge downstream
- Brooklands On the River Wey · 5.9 km along the river
- Nearest gauge upstream
- Send On the East Clandon Stream · 3.4 km along the river
- Why it was sampled
- Environmental monitoring statutory (EU directives) (21 samples)
Main measurements, river water
Dissolved oxygen
% saturation · code 9901 · %
104%
Sampled 13 Aug 2026, 49 days ago · 21 results banked
Every result (21)
| Sampled | Result as published | Reads as |
|---|---|---|
| 13 Aug 2026, 13:07 | 104 | 104% |
| 6 Jul 2026, 14:12 | 129.7 | 129.7% |
| 22 Jun 2026, 16:17 | 108.1 | 108.1% |
| 12 May 2026, 13:43 | 97.3 | 97.3% |
| 24 Apr 2026, 13:15 | 99.1 | 99.1% |
| 2 Mar 2026, 13:32 | 95.6 | 95.6% |
| 11 Feb 2026, 13:23 | 91.9 | 91.9% |
| 6 Jan 2026, 15:03 | 95.8 | 95.8% |
| 18 Dec 2025, 14:49 | 90.3 | 90.3% |
| 27 Nov 2025, 13:19 | 96.5 | 96.5% |
| 24 Oct 2025, 14:19 | 88.4 | 88.4% |
| 4 Apr 2025, 16:22 | 104 | 104% |
| 19 Mar 2025, 12:12 | 100.9 | 100.9% |
| 17 Feb 2025, 13:28 | 93.3 | 93.3% |
| 9 Jan 2025, 13:42 | 90.6 | 90.6% |
| 17 Dec 2024, 11:57 | 93.2 | 93.2% |
| 29 Nov 2024, 11:07 | 91.2 | 91.2% |
| 24 Oct 2024, 12:13 | 90.8 | 90.8% |
| 13 Sep 2024, 15:09 | 97.3 | 97.3% |
| 7 Aug 2024, 10:07 | 89.5 | 89.5% |
| 31 Jul 2024, 11:48 | 91.4 | 91.4% |
Dissolved oxygen
as O2 · code 9924 · mg/l
9.11 mg/l
Sampled 13 Aug 2026, 49 days ago · 21 results banked
Every result (21)
| Sampled | Result as published | Reads as |
|---|---|---|
| 13 Aug 2026, 13:07 | 9.11 | 9.11 mg/l |
| 6 Jul 2026, 14:12 | 10.8 | 10.8 mg/l |
| 22 Jun 2026, 16:17 | 9.15 | 9.15 mg/l |
| 12 May 2026, 13:43 | 10.1 | 10.1 mg/l |
| 24 Apr 2026, 13:15 | 10.2 | 10.2 mg/l |
| 2 Mar 2026, 13:32 | 10.6 | 10.6 mg/l |
| 11 Feb 2026, 13:23 | 10.5 | 10.5 mg/l |
| 6 Jan 2026, 15:03 | 13.2 | 13.2 mg/l |
| 18 Dec 2025, 14:49 | 10.3 | 10.3 mg/l |
| 27 Nov 2025, 13:19 | 11.4 | 11.4 mg/l |
| 24 Oct 2025, 14:19 | 9.68 | 9.68 mg/l |
| 4 Apr 2025, 16:22 | 10.8 | 10.8 mg/l |
| 19 Mar 2025, 12:12 | 12.1 | 12.1 mg/l |
| 17 Feb 2025, 13:28 | 11.9 | 11.9 mg/l |
| 9 Jan 2025, 13:42 | 11.8 | 11.8 mg/l |
| 17 Dec 2024, 11:57 | 10.9 | 10.9 mg/l |
| 29 Nov 2024, 11:07 | 11.5 | 11.5 mg/l |
| 24 Oct 2024, 12:13 | 9.81 | 9.81 mg/l |
| 13 Sep 2024, 15:09 | 10 | 10 mg/l |
| 7 Aug 2024, 10:07 | 8.45 | 8.45 mg/l |
| 31 Jul 2024, 11:48 | 8.18 | 8.18 mg/l |
Water temperature
code 0076 · °C
21.8 °C
Sampled 13 Aug 2026, 49 days ago · 21 results banked
Every result (21)
| Sampled | Result as published | Reads as |
|---|---|---|
| 13 Aug 2026, 13:07 | 21.8 | 21.8 °C |
| 6 Jul 2026, 14:12 | 24.3 | 24.3 °C |
| 22 Jun 2026, 16:17 | 23.6 | 23.6 °C |
| 12 May 2026, 13:43 | 13.5 | 13.5 °C |
| 24 Apr 2026, 13:15 | 14 | 14 °C |
| 2 Mar 2026, 13:32 | 10.5 | 10.5 °C |
| 11 Feb 2026, 13:23 | 9.5 | 9.5 °C |
| 6 Jan 2026, 15:03 | 2 | 2 °C |
| 18 Dec 2025, 14:49 | 9.6 | 9.6 °C |
| 27 Nov 2025, 13:19 | 8 | 8 °C |
| 24 Oct 2025, 14:19 | 11.2 | 11.2 °C |
| 4 Apr 2025, 16:22 | 13.4 | 13.4 °C |
| 19 Mar 2025, 12:12 | 7.4 | 7.4 °C |
| 17 Feb 2025, 13:28 | 4.9 | 4.9 °C |
| 9 Jan 2025, 13:42 | 4.1 | 4.1 °C |
| 17 Dec 2024, 11:57 | 8.5 | 8.5 °C |
| 29 Nov 2024, 11:07 | 5.5 | 5.5 °C |
| 24 Oct 2024, 12:13 | 11.8 | 11.8 °C |
| 13 Sep 2024, 15:09 | 13.9 | 13.9 °C |
| 7 Aug 2024, 10:07 | 18 | 18 °C |
| 31 Jul 2024, 11:48 | 20.7 | 20.7 °C |
pH
code 0061
8.38
Sampled 13 Aug 2026, 49 days ago · 21 results banked
Every result (21)
| Sampled | Result as published | Reads as |
|---|---|---|
| 13 Aug 2026, 13:07 | 8.38 | 8.38 |
| 6 Jul 2026, 14:12 | 8.76 | 8.76 |
| 22 Jun 2026, 16:17 | 8.59 | 8.59 |
| 12 May 2026, 13:43 | 7.85 | 7.85 |
| 24 Apr 2026, 13:15 | 7.93 | 7.93 |
| 2 Mar 2026, 13:32 | 7.9 | 7.9 |
| 11 Feb 2026, 13:23 | 7.62 | 7.62 |
| 6 Jan 2026, 15:03 | 7.85 | 7.85 |
| 18 Dec 2025, 14:49 | 7.63 | 7.63 |
| 27 Nov 2025, 13:19 | 7.54 | 7.54 |
| 24 Oct 2025, 14:19 | 7.58 | 7.58 |
| 4 Apr 2025, 16:22 | 8.16 | 8.16 |
| 19 Mar 2025, 12:12 | 7.9 | 7.9 |
| 17 Feb 2025, 13:28 | 7.74 | 7.74 |
| 9 Jan 2025, 13:42 | 7.68 | 7.68 |
| 17 Dec 2024, 11:57 | 7.83 | 7.83 |
| 29 Nov 2024, 11:07 | 7.51 | 7.51 |
| 24 Oct 2024, 12:13 | 7.63 | 7.63 |
| 13 Sep 2024, 15:09 | 7.85 | 7.85 |
| 7 Aug 2024, 10:07 | 7.74 | 7.74 |
| 31 Jul 2024, 11:48 | 7.63 | 7.63 |
Ammonia
ammoniacal nitrogen as N · code 0111 · mg/l
0.031 mg/l
Sampled 13 Aug 2026, 49 days ago · 21 results banked
Every result (21)
| Sampled | Result as published | Reads as |
|---|---|---|
| 13 Aug 2026, 13:07 | 0.031 | 0.031 mg/l |
| 6 Jul 2026, 14:12 | 0.035 | 0.035 mg/l |
| 22 Jun 2026, 16:17 | 0.041 | 0.041 mg/l |
| 12 May 2026, 13:43 | 0.076 | 0.076 mg/l |
| 24 Apr 2026, 13:15 | 0.056 | 0.056 mg/l |
| 2 Mar 2026, 13:32 | 0.11 | 0.11 mg/l |
| 11 Feb 2026, 13:23 | 0.16 | 0.16 mg/l |
| 6 Jan 2026, 15:03 | 0.36 | 0.36 mg/l |
| 18 Dec 2025, 14:49 | 0.062 | 0.062 mg/l |
| 27 Nov 2025, 13:19 | 0.066 | 0.066 mg/l |
| 24 Oct 2025, 14:19 | 0.086 | 0.086 mg/l |
| 4 Apr 2025, 16:22 | <0.03 | below 0.03 mg/l (not detected above this) |
| 19 Mar 2025, 12:12 | 0.13 | 0.13 mg/l |
| 17 Feb 2025, 13:28 | 0.17 | 0.17 mg/l |
| 9 Jan 2025, 13:42 | 0.12 | 0.12 mg/l |
| 17 Dec 2024, 11:57 | 0.1 | 0.1 mg/l |
| 29 Nov 2024, 11:07 | 0.069 | 0.069 mg/l |
| 24 Oct 2024, 12:13 | 0.037 | 0.037 mg/l |
| 13 Sep 2024, 15:09 | <0.03 | below 0.03 mg/l (not detected above this) |
| 7 Aug 2024, 10:07 | 0.057 | 0.057 mg/l |
| 31 Jul 2024, 11:48 | 0.044 | 0.044 mg/l |
Nitrate
as nitrogen (N) · code 0117 · mg/l
8.58 mg/l
Sampled 13 Aug 2026, 49 days ago · 21 results banked
Every result (21)
| Sampled | Result as published | Reads as |
|---|---|---|
| 13 Aug 2026, 13:07 | 8.58 | 8.58 mg/l |
| 6 Jul 2026, 14:12 | 7.75 | 7.75 mg/l |
| 22 Jun 2026, 16:17 | 6.14 | 6.14 mg/l |
| 12 May 2026, 13:43 | 7.52 | 7.52 mg/l |
| 24 Apr 2026, 13:15 | 7.02 | 7.02 mg/l |
| 2 Mar 2026, 13:32 | 4.45 | 4.45 mg/l |
| 11 Feb 2026, 13:23 | 3.27 | 3.27 mg/l |
| 6 Jan 2026, 15:03 | 7.01 | 7.01 mg/l |
| 18 Dec 2025, 14:49 | 4.95 | 4.95 mg/l |
| 27 Nov 2025, 13:19 | 6.23 | 6.23 mg/l |
| 24 Oct 2025, 14:19 | 4.72 | 4.72 mg/l |
| 4 Apr 2025, 16:22 | 6.25 | 6.25 mg/l |
| 19 Mar 2025, 12:12 | 6.24 | 6.24 mg/l |
| 17 Feb 2025, 13:28 | 5.25 | 5.25 mg/l |
| 9 Jan 2025, 13:42 | 2.97 | 2.97 mg/l |
| 17 Dec 2024, 11:57 | 5.15 | 5.15 mg/l |
| 29 Nov 2024, 11:07 | 2.37 | 2.37 mg/l |
| 24 Oct 2024, 12:13 | 4.15 | 4.15 mg/l |
| 13 Sep 2024, 15:09 | 5.56 | 5.56 mg/l |
| 7 Aug 2024, 10:07 | 6.14 | 6.14 mg/l |
| 31 Jul 2024, 11:48 | 6.95 | 6.95 mg/l |
Phosphate
orthophosphate, reactive, as P · code 0180 · mg/l
0.23 mg/l
Sampled 13 Aug 2026, 49 days ago · 21 results banked
Every result (21)
| Sampled | Result as published | Reads as |
|---|---|---|
| 13 Aug 2026, 13:07 | 0.23 | 0.23 mg/l |
| 6 Jul 2026, 14:12 | 0.17 | 0.17 mg/l |
| 22 Jun 2026, 16:17 | 0.17 | 0.17 mg/l |
| 12 May 2026, 13:43 | 0.18 | 0.18 mg/l |
| 24 Apr 2026, 13:15 | 0.13 | 0.13 mg/l |
| 2 Mar 2026, 13:32 | 0.12 | 0.12 mg/l |
| 11 Feb 2026, 13:23 | 0.15 | 0.15 mg/l |
| 6 Jan 2026, 15:03 | 0.16 | 0.16 mg/l |
| 18 Dec 2025, 14:49 | 0.14 | 0.14 mg/l |
| 27 Nov 2025, 13:19 | 0.16 | 0.16 mg/l |
| 24 Oct 2025, 14:19 | 0.17 | 0.17 mg/l |
| 4 Apr 2025, 16:22 | 0.085 | 0.085 mg/l |
| 19 Mar 2025, 12:12 | 0.087 | 0.087 mg/l |
| 17 Feb 2025, 13:28 | 0.1 | 0.1 mg/l |
| 9 Jan 2025, 13:42 | 0.11 | 0.11 mg/l |
| 17 Dec 2024, 11:57 | 0.14 | 0.14 mg/l |
| 29 Nov 2024, 11:07 | 0.19 | 0.19 mg/l |
| 24 Oct 2024, 12:13 | 0.15 | 0.15 mg/l |
| 13 Sep 2024, 15:09 | 0.16 | 0.16 mg/l |
| 7 Aug 2024, 10:07 | 0.19 | 0.19 mg/l |
| 31 Jul 2024, 11:48 | 0.18 | 0.18 mg/l |
Conductivity
at 25 °C · code 0077 · µS/cm
526 µS/cm
Sampled 13 Aug 2026, 49 days ago · 21 results banked
Every result (21)
| Sampled | Result as published | Reads as |
|---|---|---|
| 13 Aug 2026, 13:07 | 526 | 526 µS/cm |
| 6 Jul 2026, 14:12 | 505 | 505 µS/cm |
| 22 Jun 2026, 16:17 | 518 | 518 µS/cm |
| 12 May 2026, 13:43 | 490 | 490 µS/cm |
| 24 Apr 2026, 13:15 | 498 | 498 µS/cm |
| 2 Mar 2026, 13:32 | 477 | 477 µS/cm |
| 11 Feb 2026, 13:23 | 415 | 415 µS/cm |
| 6 Jan 2026, 15:03 | 503 | 503 µS/cm |
| 18 Dec 2025, 14:49 | 535 | 535 µS/cm |
| 27 Nov 2025, 13:19 | 476 | 476 µS/cm |
| 24 Oct 2025, 14:19 | 437 | 437 µS/cm |
| 4 Apr 2025, 16:22 | 505 | 505 µS/cm |
| 19 Mar 2025, 12:12 | 524 | 524 µS/cm |
| 17 Feb 2025, 13:28 | 519 | 519 µS/cm |
| 9 Jan 2025, 13:42 | 446 | 446 µS/cm |
| 17 Dec 2024, 11:57 | 484 | 484 µS/cm |
| 29 Nov 2024, 11:07 | 307 | 307 µS/cm |
| 24 Oct 2024, 12:13 | 442 | 442 µS/cm |
| 13 Sep 2024, 15:09 | 441 | 441 µS/cm |
| 7 Aug 2024, 10:07 | 459 | 459 µS/cm |
| 31 Jul 2024, 11:48 | 496 | 496 µS/cm |
Everything measured here
13 determinands, each kept by its code, unit and sample material: results in different units or on different materials are never mixed. A “below” result is under the laboratory's detection limit, not zero.
Show all 13 rows
| Determinand | Material | Results | First – last | Latest result |
|---|---|---|---|---|
| Oxygen, Dissolved, % Saturation 9901 | River water | 21 | Jul 2024 – Aug 2026 | 104% 13 Aug 2026 |
| Oxygen, Dissolved as O2 9924 | River water | 21 | Jul 2024 – Aug 2026 | 9.11 mg/l 13 Aug 2026 |
| Temperature of Water 0076 | River water | 21 | Jul 2024 – Aug 2026 | 21.8 °C 13 Aug 2026 |
| pH 0061 | River water | 21 | Jul 2024 – Aug 2026 | 8.38 13 Aug 2026 |
| Ammoniacal Nitrogen as N 0111 | River water | 21 | Jul 2024 – Aug 2026 | 0.031 mg/l 13 Aug 2026 |
| Nitrate as N 0117 | River water | 21 | Jul 2024 – Aug 2026 | 8.58 mg/l 13 Aug 2026 |
| Orthophosphate, reactive as P 0180 | River water | 21 | Jul 2024 – Aug 2026 | 0.23 mg/l 13 Aug 2026 |
| Conductivity at 25 C 0077 | River water | 21 | Jul 2024 – Aug 2026 | 526 µS/cm 13 Aug 2026 |
| Alkalinity to pH 4.5 as CaCO3 0162 | River water | 21 | Jul 2024 – Aug 2026 | 110 mg/l 13 Aug 2026 |
| Ammonia un-ionised as N 0119 | River water | 21 | Jul 2024 – Aug 2026 | 0.00133 mg/l 13 Aug 2026 |
| BOD : 5 Day ATU 0085 | River water | 16 | Jul 2024 – Mar 2026 | 1.5 mg/l 2 Mar 2026 |
| Nitrite as N 0118 | River water | 21 | Jul 2024 – Aug 2026 | 0.024 mg/l 13 Aug 2026 |
| Nitrogen, Total Oxidised as N 0116 | River water | 21 | Jul 2024 – Aug 2026 | 8.6 mg/l 13 Aug 2026 |
FloodRadar does not grade these results: there is no overall score, and official river classifications are a separate dataset. A sample taken downstream of an overflow does not by itself show where anything in it came from. River connections and distances are traced on OS Open Rivers (edition 2026-04), which leaves out many small channels.
Water samples: Environment Agency Water Quality Archive, © Environment Agency and/or database right 2026, Open Government Licence v3.0.
Contains OS data © Crown copyright and database rights 2026.